"Yes, how, not necessarily what. That is, Jesus was revealing not so much the content of what to pray, but the disposition of the heart; He was not giving a specific prayer so much as showing us how, as God’s children, to approach Him. For just a couple verses earlier, Jesus said, “In praying, do not babble like the pagans, who think that they will be heard because of their many words.” [1] Rather…

…the hour is coming, and is now here, when true worshipers will worship the Father in spirit and truth; and indeed the Father seeks such people to worship him. (John 4:23)

To worship the Father in “spirit” means to worship Him with the heart, to speak to Him as a loving father. To worship the Father in “truth” means to come to Him in the reality of who He is—and who I am, and am not. If we meditate on what Jesus is teaching here, we will find that the Our Father reveals to us how to pray in “spirit and truth”. How to pray with the heart."